Trace Elements in West Virginia Coals

Stratigraphic Distribution of Terbium (Tb)

The stratigraphic distribution of Terbium (Tb) shows consistently low
(<0.5 ppm) averages in most West Virginia coals with slightly higher
Tb in coals of the Pocahontas and lower New River Formations and low Tb
in Conemaugh and Monongahela Group coals, especially the Pittsburgh, Redstone
and Sewickley.